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AHF2805D Datasheet

HYBRID-HIGH RELIABILITY DC-DC CONVERTER

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HYBRID-HIGH RELIABILITY
DC-DC CONVERTER
PD-94541E
AHF SERIES
28V Input, Single/Dual Output
 
Description
The AHF Series of DC-DC converters feature single or dual
outputs over the full military temperature range. No derating
in output power is required, making them suitable for use in
rugged military applications. The low profile, small outline
package is ideally suited to the tight board space require-
ments of many industrial and aerospace applications.
Designed for nominal 28Vdc inputs, this family of converters
will meet the requirements of MIL-STD-704D. The basic cir-
cuit utilizes a pulse width modulated, feed-forward topology
at a nominal switching frequency of 550KHz. Input to output
isolation is achieved through the use of transformers in the
forward and feedback circuits.
The proprietary magnetic feedback circuit provides for an
extremely wide bandwidth control loop with a high phase
margin. The closed loop frequency response of this converter
family extends to approximately 50kHz, resulting in superior
line and load transient characteristics. This feedback method
is also inherently temperature and radiation insensitive. This
gives the AHF Series an important advantage over convert-
ers that incorporate opto-couplers in their design.
Manufactured in a facility fully qualified to MIL-PRF-38534,
these converters are fabricated utilizing DLA qualified process.
For available screening options, refer to device screening
table in the data sheet. Variations are electrical, mechanical
and screening can be accommodated.
Extensive computer simulation using complex modeling
enables rapid design modification to be provided. Contact IR
HiRel San Jose with specific requirements.
AHF
Features
16V to 40VDC Input Range (28VDC Nominal)
 Single and Dual Outputs
12W Output Power
 22.8W/in3 Power Density
 Low Input / Output Noise
(50mA / 60mVP-P max. respectively)
 Indefinite Short Circuit and Overload Protection
 Wideband Control Loop for Superior Transient
Characteristics
 No derating for -55°C to +125°C Operation
Constant Switching Frequency
(550kHz Nominal)
 Standard Microcircuit Drawings Available
1 2017-05-08


International Rectifier Electronic Components Datasheet

AHF2805D Datasheet

HYBRID-HIGH RELIABILITY DC-DC CONVERTER

No Preview Available !

AHF SERIES
(28V Input, Single/Dual Output)
Specifications
Absolute Maximum Ratings
Input Voltage
Soldering temperature
Operating case temperature
Storage case temperature
 
-0.5Vdc to +50VDC
+300°C for 10 seconds
-55°C to +125°C
-65°C to +135°C
Table I. Electrical Performance Characteristics
AHF2803R3S
Parameter
Symbol
Conditions
-55°C TC +125°C
VIN = 28 VDC ± 5%, CL = 0
Unless otherwise specified
Group A
Subgroups
Device
Types
Limits
Min Max
Unit
Output voltage
Output current1
VOUT IOUT = 5% of rated load
IOUT VIN = 16, 28, and 40Vdc
1
2,3
1,2,3
3.26 3.34
01 3.23 3.36 V
01 3030 mA
Output power
POUT VIN = 16, 28, and 40Vdc
1,2,3
01
10 W
Output ripple voltage2
Line regulation
Load regulation
Input current
Input ripple current2
VRIP
VRLINE
VRLOAD
IIN
IRIP
VIN = 16, 28, and 40Vdc,
B.W. = 20 Hz to 2MHz
VIN = 16, 28, and 40Vdc,
IOUT = 5%, 50% and 100%
rated load
VIN = 16, 28, and 40Vdc,
IOUT = 5%, 50% and 100%
rated load
IOUT = 0, Inhibit (Pin 1)
tied to Input Return (Pin 7)
IOUT = 0,
Inhibit (Pin 1) = open
IOUT = 100% rated load
B.W. = 20 Hz to 2 MHz
1,2,3
1,2,3
1,2,3
01
01
01
1,2,3
01
1,2,3
01
60 mVp-p
25 mV
50 mV
12
mA
30
50 mAp-p
Efficiency
Isolation
Capacitive load3,4
Power dissipation
load fault
EFF IOUT = 100% rated load
Input to output or any pin
ISO to case (except Pin 6) at
500Vdc TC = +25°C
CL
No effect on dc performance,
TC = +25°C
PD Overload 5
Short circuit
1
2,3
1
4
1
1,2,3
01 70
68
01 100
%
M
01 500 µF
01 6.0 W
01 2.0
Switching frequency
FS IOUT = 100% rated load
4,5,6
01 500 600 kHz
For Notes to Electrical Performance Characteristics, refer to page 3
2 2017-05-08


Part Number AHF2805D
Description HYBRID-HIGH RELIABILITY DC-DC CONVERTER
Maker International Rectifier
Total Page 20 Pages
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